I suspect the change in the post processor, with the stated intention of making the NAM and GFS post processing schemes uniform, has eliminated a smoothing process that has heretofore existed with the 0.5 GFS model output. The "new" look of this field recalls the "noisiness" that we have typically seen with the hi-res NAM output.
Any way to see if the pre-9/25 1200 UTC fields had smoothing built-in to the postprocessor?
______________________________________________________________________ Kevin Tyle, Systems Administrator ********************** Dept. of Earth & Atmospheric Sciences ktyle@xxxxxxxxxxxxxxxx University at Albany, ES-235 518-442-4578 (voice) 1400 Washington Avenue 518-442-5825 (fax) Albany, NY 12222 ********************** ______________________________________________________________________ On Fri, 28 Sep 2007, David Knight wrote:
But that notice http://www.nws.noaa.gov/om/notification/tin07-59gfs_upgrade_unifiedpost.txt says: "THE PRIMARY IMPACT TO CUSTOMERS RECEIVING THE GFS WILL BE THAT THE DEFAULT PRECIPITATION TYPE ALGORITHM WILL CHANGE" and further "THE PRODUCTS/GRIDS WHICH ARE DISSEMINATED TO NOAAPORT AND/OR THE SATELLITE BROADCAST NETWORK /SBN/ WILL NOT BE CHANGED IN VOLUME OR CONTENT." So there appears to be more to this than that . . . David "> Harry,NCEP posted a notice regarding change in the GFS postprocessor coincident with the 12Z Sep 25 run: http://www.nws.noaa.gov/om/notification/tin07-59gfs_upgrade_unifiedpost.txt Steve Chiswell Unidata User Support On Fri, 2007-09-28 at 10:01 -0700, Harry Edmon wrote:I have had a couple of users complain about changes in the GFS data starting with the 1200 UTC run on 25 September. I notice there is a jump up in the size of the gempak files starting with that run. Does anyone know of any changes? If you are curious about what I am talking about, look at this page, which uses the 0.5 degree data: http://www.atmos.washington.edu/~hakim/loop.psp?url=~hakim/tropo/theta/ Start the loop and look at the areas in white go from smooth to noisy with the 1200 UTC 25th run. Another user is now having problems with his WRF initialization that he did not have before this. _______________________________________________ conduit mailing list conduit@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/-- Steve Chiswell <chiz@xxxxxxxxxxxxxxxx> Unidata _______________________________________________ ldm-users mailing list ldm-users@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/_______________________________________________ ldm-users mailing list ldm-users@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/
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